Protective layer for a metal substrate and a method of producing same
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United States of America Patent
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Jul 27, 1993
Grant Date -
N/A
app pub date -
Jan 15, 1991
filing date -
Jan 22, 1990
priority date (Note) -
Expired
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Abstract
A protective layer for a metal substrate is metallurgically bonded to the substrate and contains (as a percentage by mass) 35 to 50% chromium, up to 10% of which can be replaced by molybdenium, and at least iron, the proportion of iron being at least 25%. The minimum hardness is 800 HVO.1, obtained by a structure having a minimum content of 5% by volume as sigma phase. The sigma phase is obtained by heat-treatment of the coated substrate. The protective layer is particularly resistant to corrosion and also has good resistance to erosion and wear.
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